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109777 (2001 RY81)
Classification: Main-belt Asteroid          SPK-ID: 2109777
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

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For accurate long-term ephemerides, please instead use our Horizons system.This orbit viewer was implemented using two-body methods, and hence should not be used for determining accurate long-term trajectories (over several years or decades) or planetary encounter circumstances.


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Orbital Elements at Epoch 2459000.5 (2020-May-31.0) TDB
Reference: JPL 21 (heliocentric ecliptic J2000)
 Element Value Uncertainty (1-sigma)   Units 
e .1751635906825176 6.1618e-08  
a 2.658246839335983 1.3423e-08 au
q 2.192618778037439 1.5997e-07 au
i 13.36463593276522 5.5565e-06 deg
node 30.25811253085121 1.851e-05 deg
peri 11.11619395575693 2.5532e-05 deg
M 96.21947024326549 1.5047e-05 deg
tp 2458577.391405796226
(2019-Apr-03.89140580)
6.5357e-05 TDB
period 1583.038168140607
4.33
1.199e-05
3.283e-08
d
yr
n .2274108150044457 1.7224e-09 deg/d
Q 3.123874900634527 1.5774e-08 au
  Orbit Determination Parameters
   # obs. used (total)      755  
   data-arc span      7752 days (21.22 yr)  
   first obs. used      1999-03-21  
   last obs. used      2020-06-10  
   planetary ephem.      DE431  
   SB-pert. ephem.      SB431-N16  
   condition code      0  
   norm. resid. RMS      .5162  
   source      ORB  
   producer      Otto Matic  
   solution date      2020-Nov-12 19:09:53  

Additional Information
 Earth MOID = 1.20176 au 
 Jupiter MOID = 2.31905 au 
 T_jup = 3.327 
[ show covariance matrix ]

Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]

Physical Parameter Table
Parameter Symbol Value Units Sigma Reference Notes
absolute magnitude H 15.5   n/a MPO412774  
rotation period rot_per 7.93 h n/a LCDB (Rev. 2019-August); Warner et al., 2009 Result based on less than full coverage, so that the period may be wrong by 30 percent or so.
Published Reference List:
[Chang, C.-K.; Lin, H.-W.; Ip, W.-H.; Prince, T.A.; et al. (2016) Astrophys. J. Sup. Ser. 227, A20.]

109777 (2001 RY81)          Discovered 2001-Sep-14 by Kusnirak, P. at Ondrejov
Reference: 20051019/Numbers.arcLast Updated: 2005-10-26

[ show close-approach data ]
Ephemeris | Orbit Diagram | Orbital Elements | Mission Design | Physical Parameters | Discovery Circumstances | Close-Approach Data ]
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